An integer overflow in CrwMap::encode0x1810 of Exiv2 0.27.3 allows attackers to trigger a heap-based buffer overflow and cause a denial of…

published 2021-07-26 5 y ago modified 2026-06-17 4 mo ago also PYSEC-2021-877 , EUVD-2021-0073

cvss: 7.5; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 2.6%; EPSS 2.6% chance of exploitation in 30 days, percentile 85%
public exploits: 0; none known

An integer overflow in CrwMap::encode0x1810 of Exiv2 0.27.3 allows attackers to trigger a heap-based buffer overflow and cause a denial of service (DOS) via crafted metadata.

Patch / fix

distros 5 links 1

debian red hat suse almalinux rocky linux

exiv2 Debian 14, Debian 13, Debian 12 0.27.3-3.1

debian advisories DEBIAN-CVE-2021-31292

exiv2 RHEL 8 0.27.4-5.el8
exiv2-libs RHEL 8 0.27.4-5.el8
compat-exiv2-026 RHEL 8 0.26-6.el8

red hat advisories RHSA-2021:4173 RHSA-2021:4319

exiv2 SLES for SAP 15 SP2, SLES for SAP 15 SP1, SLES for SAP 15 +20 more 0.26-150000.6.16.1

suse advisories SUSE-SU-2022:3598-1

compat-exiv2-026 AlmaLinux 8 0.26-6.el8
exiv2 AlmaLinux 8 0.27.4-5.el8
exiv2-libs AlmaLinux 8 0.27.4-5.el8

almalinux advisories ALSA-2021:4319 ALSA-2021:4173

compat-exiv2-026 Rocky Linux 8 0.26-6.el8
exiv2 Rocky Linux 8 0.27.4-5.el8

rocky linux advisories RLSA-2021:4319 RLSA-2021:4173

github.com/Exiv2/exiv2/issues/1530 advisory

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-31292 updated 2026-11-07 cvss 7.5

exiv2: Integer overflow in CrwMap:encode0x1810 leading to heap-based buffer overflow and DoS

Red Hat Enterprise Linux 6 exiv2, exiv2-libs Red Hat Enterprise Linux 7 exiv2, exiv2-libs, compat-exiv2-023, compat-exiv2-026
affected: no fix planned “Out of support scope”
Red Hat CodeReady Linux Builder (v. 8) exiv2-doc 0.27.4-5.el8, exiv2-devel 0.27.4-5.el8, exiv2-debuginfo 0.27.4-5.el8, exiv2-debugsource 0.27.4-5.el8, exiv2-libs-debuginfo 0.27.4-5.el8
fixed: vendor fix RHSA-2021:4173
Red Hat Enterprise Linux AppStream (v. 8) exiv2 0.27.4-5.el8, exiv2-libs 0.27.4-5.el8, compat-exiv2-026 0.26-6.el8
fixed: vendor fix RHSA-2021:4319
Red Hat Enterprise Linux 9 exiv2, exiv2-libs
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.56% chance of exploitation in the next 30 days, higher than 85% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/Exiv2/exiv2/issues/1530 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:N/I:N/A:P
OSV	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem	package	affected	fixed in
pypi	exiv2	all versions	no fix listed

Classification

Weakness

CWE-190 Integer Overflow or Wraparound

References

github.com /Exiv2/exiv2/issues/1530
exploit, issue-tracking, patch, third-party-advisory
debian.org /security/2021/dsa-4958
vendor-advisory, third-party-advisory, advisory
lists.fedoraproject.org /archives/list/package-announce%40lists.fedoraproject.org/message/FMDT4PJB7P43WSOM3TRQIY3J33BAFVVE/
vendor-advisory, web
lists.fedoraproject.org /archives/list/package-announce%40lists.fedoraproject.org/message/UYGDELIFFJWKUU7SO3QATCIXCZJERGAC/
vendor-advisory, web
security.gentoo.org /glsa/202312-06
vendor-advisory
lists.debian.org /debian-lts-announce/2021/08/msg00028.html
mailing-list, third-party-advisory, web

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary